<template>
  <el-container class="home-container">
    <!--头部 -->
    <el-header>
      <div>
        <img src="../assets/EDG.png" alt style="height: 60px;width:60px" />
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--主体 -->
    <el-container>
      <!--侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div> 
      <!--侧边菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409BFF" unique-opened
          :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
          <el-submenu :index="item.id+''" v-for="item in menulist" :id="item.id">
            <!--一级菜单-->
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span class="span-left">{{item.authName}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :id="subItem.id"
              @click="saveNavState('/' + subItem.path)">
              <template slot="title" >
              <i class="el-icon-ice-cream-round"></i>
              <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
            </el-submenu>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      //左侧菜单数据
      menulist: [],  
      iconsObj: {
        '125': 'el-icon-user',
        '103': 'el-icon-view',
        '101': 'el-icon-goods',
        '102': 'el-icon-s-order',
        '145': 'el-icon-data-line'
      },
      //是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
 created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 3px;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center; //纵向对齐
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
}
.el-menu {
  border-right: none;
}
.el-main {
  background-color: #eaedf1;
}
.span-left {
  margin-left: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;//悬浮位置，鼠标变为小手
}
</style>